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Question

Which of the following is not correct?

A
AAC if and only if A=ϕ
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B
ACAA=x where x is universal set
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C
If AB=AC, then B=C
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D
A=C is equivalent to AB=BC and AB=BC
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Solution

The correct option is C If AB=AC, then B=C

Let A={1,2}
B={2,3,4,5}
C={3,4,5}
Here, AB=AC But BC


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